7215AC Angular Contact Ball Bearings High Precision Bearings Versatile Performance

7215AC Angular Contact Ball Bearing High Precision Versatile Performance

Basic Parameters

• Bore diameter (d):75mm
• Outer diameter (D):130mm
• Width (B):25mm
• Contact angle:25° (suffix "AC" denotes standard angle)
• Weight:Approximately 3.6~3.8kg (typical range)
• Structure:Single-row, non-separable design with inner/outer rings and ball assembly. Cage options include pressed steel (J steel stamping) for heavy loads or brass solid cage for high-speed stability .

Core Performance Specifications

1. Load Capacity
   • Dynamic load rating (Cr):79~83kN (typical range, varies by manufacturer)
   • Static load rating (C0r):68.5~70kN (typical range)
   • Material:GCr15/SUJ2 high-carbon chromium bearing steel (HRC58-62), with optional stainless steel (SUS440C) or ceramic (Si3N4 balls) variants for corrosive or high-speed environments .
2. Speed & Precision
   • Limiting speed:
     • Grease-lubricated: 4,300~4,800rpm (typical range)
     • Oil-lubricated: 5,800~6,300rpm (optimized for continuous operation)
   • Precision class:Standard P0 (customizable to P5/P4 for machine tool spindles or robotics) .
3. Technical Features
   • Axial-radial load capability:Supports combined radial loads and unidirectional axial thrust. Paired installation (e.g., back-to-back) required for bidirectional loads .
   • Friction reduction design:Optimized raceway geometry minimizes heat generation during high-speed rotation.

Structural & Environmental Adaptability

• Tolerance compatibility:
  • Shaft: H7/k6
  • Housing: J7
• Temperature range:
  • Standard: -20°C to 120°C
  • High-temperature variants: Up to 300°C with ceramic components and specialized lubricants .
• Sealing options:
  • Open design (standard)
  • Optional 2RS (rubber seals) or ZZ (metal shields) for dust/moisture protection .

Typical Applications

1. Industrial Machinery
   • Gearboxes:Handles radial loads in mining, construction, and agricultural equipment drivetrains.
   • Pumps & compressors:Resists fluid pressure in water treatment or oil/gas systems.
   • Wind turbine pitch/yaw drives:Supports dynamic loads in 1.5MW+ wind generators .
2. Transportation
   • Automotive transmissions:Used in passenger car or light truck differentials.
   • Marine gearboxes:Corrosion-resistant variants (SUS440C) for saltwater environments .
3. Precision Equipment
   • CNC machine tool spindles:Provides rigidity for milling and turning operations (custom P5 precision).
   • Industrial robotics:Enables precise positioning in robotic arms handling payloads up to 300kg .

Maintenance & Lubrication Guidelines

• Lubrication:
  • Grease:Lithium-based grease (NLGI 2) with 15%-20% cavity filling; synthetic polyurea grease recommended for temperatures >120°C .
  • Oil:Circulating oil systems with ISO VG 32-46 oils for high-speed applications to enhance heat dissipation.
• Inspection intervals:
  • Monitor vibration and temperature every 8-10 hours in heavy-duty cycles.
  • Replace lubricant every 3,000~6,000 hours depending on load severity.

Certifications & Compatibility

• Standards compliance:Meets ISO 9001:2015 and industry standards (e.g., ISO 281 for load ratings) .
• Cross-brand compatibility:Interchangeable with equivalent standard models from brands like NSK, SKF, and NACHI .

Customization Options

1. Material Upgrades
   • Ceramic variants:Full ceramic (Si3N4 balls) for non-magnetic or high-speed applications (dynamic load: ~55kN, static load: ~48kN).
   • Stainless steel:SUS440C for marine or chemical processing environments (corrosion resistance up to 800 hours in salt spray tests) .
2. Special Configurations
   • Phosphating coatings:Improves wear resistance in dusty or abrasive conditions.
   • Laser-etched part numbers:Enhances traceability in critical infrastructure applications.

Summary

The 7215AC angular contact ball bearing balances high load capacity (up to 83kN dynamic), precision, and adaptability, making it ideal for medium-to-heavy duty industrial, transportation, and precision equipment. Its standardized design simplifies installation, while material and sealing options extend usability across diverse environments. With proper lubrication and maintenance, it delivers reliable performance in high-load, high-speed scenarios.